Frank Morley (September 9, 1860 – October 17, 1937) was a leading mathematician, known mostly for his teaching and research in the fields of algebra and geometry.

Among his mathematical accomplishments was the discovery and proof of the celebrated Morley's trisector theorem in elementary plane geometry.

He led 50 Ph.D. students, including Clara Latimer Bacon, to their degrees, and was said to be Morley was born in the town of Woodbridge in Suffolk, England.

His parents were Elizabeth Muskett and Joseph Roberts Morley, Quakers who ran a china shop.

In 1933 he and his son Frank Vigor Morley published the "stimulating volume" Inversive Geometry.